1. Internal Development
   1. Goals & Motivations
      1. What characters' goals and motivations in the story?
      2. What are they willing to do to achieve the goal?
      3. What drives their inner desires to achieve the goal?
   2. Conflicts
      1. What internal conflict the character faces? (emotion, mind, desires, etc.)
   3. History/Background
      1. What moments from their past have a great influence upon them now?
      2. Where do they come from?
2. External Development
   1. Physical Appearance
      1. What do they look like?
      2. What do they sound like?
   2. Social Background
      1. How their external environment influence their personality/behavior/decison-making?
3. Read more at https://blog.reedsy.com/character-development/